Perhaps it's because we have a wood stove or because this is an old house, I don't know?
I do know, they seem to multiply very fast. Wouldn't it be great to find a market for the little critters.
I would box them up in special little crates, of coarse with nutritious dust bunny food and a bit of water for the trip.
They would arrive happy and healthy at their destination, ready to develop new colonies all over the world.